PROCEDE POUR COMPENSER UNE VARIATION DE LA HAUTEUR TABLE-COULISSEAU

METHOD OF COMPENSATING FOR SHUT HEIGHT VARIATION

Abrégé français

On décrit un procédé pour compenser une variation de la hauteur table-coulisseau d'une presse (4) pendant l'estampage et le formage, au démarrage et à l'arrêt de la course. Le procédé consiste en l'entrée par l'utilisateur d'une vitesse minimale de la presse à laquelle l'alimentation (1) de la presse en matière brute (2) doit commencer. Il consiste ensuite à surveiller (6) la vitesse réelle de la presse, et à n'alimenter la matière brute (2) que lorsqu'une vitesse minimale de la presse correspondant à une hauteur table-coulisseau désirée est atteinte. On décrit également un procédé pour entrer une plage de hauteur table-coulisseau désirée, surveiller (7) la hauteur table-coulisseau réelle, et n'alimenter la matière brute (2) que lorsque la hauteur table-coulisseau réelle se situe dans la plage de hauteur table-coulisseau désirée.

Abrégé anglais

A method for compensating for the variation in shut height of a press (4)
during stamping and forming as it is starting and stopping comprising user
input of the minimum press speed at which feeding (1) of feed material (2) to
the press (1) should commence, monitoring (6) of the actual press speed, and
feeding (1) of the feed material (2) only when a minimum press speed
representing a desired press shut height has been achieved. A method for
inputting a desired shut height range, monitoring (7) actual shut height and
feeding (1) feed material (2) only when the actual shut height is within the
desired shut height range is also disclosed.

Revendications

-11-
WHAT IS CLAIMED IS:
1. A method for compensating for the variation in shut height of a press as it
is
starting and stopping comprising:
imputing of a minimum press speed of said press at which feeding of feed
material should commence;
continuous monitoring of actual press speed of said press;
comparing the actual press speed with minimum press speed; and
feeding of said feed material by a press feed only when said actual press
speed is
at least equal to said minimum press speed.
2. The method of claim 1 wherein said feeding of said feed material by said
press
feed is stopped when said actual press speed is less than said minimum press
speed.
3. The method of claim 1 wherein said press is a high speed punch press.
4. The method of claim 1 wherein the continuous monitoring of said actual
press
speed is performed by a resolver.
5. The method of claim 1 wherein the press feed is an electronically
controlled and
electronically powered press feed.
6. The method of claim 1 wherein said minimum press speed is a press speed at
which said shut height of said press is within a desired tolerance value.
7. The method of claim 1 wherein said minimum press speed is input by direct
user
input into a controller for said press.
8. The method of claim 1 wherein said minimum press speed is input into a
controller for said press by digital signal from a user supplied auxiliary
controller.

-12-
9. A method for compensating for the variation in shut height of a press as it
is
starting and stopping comprising:
inputting of a minimum press speed of said press at which feeding of feed
material should commence to a controller;
continuous monitoring of actual press speed of said press;
feedback of said actual press speed of said press to said controller by a
feedback
device;
comparing said actual press speed of said press with said minimum press speed
of
said press by said controller;
sending a signal from said controller to a press feed to begin feeding said
feed
material to said press when said actual press speed of said press is at least
equal to
said minimum press speed; and
sending a signal from said controller to said press feed to stop feeding said
feed
material to said press when said actual press speed of said press is less than
said
minimum press speed.
10. The method of claim 9 wherein said press is a high speed punch press.
11. The method of claim 9 wherein said feedback device is a resolver.
12. The method or claim 9 wherein the press feed is an electronically
controlled and
electronically powered press feed.
13. The method of claim 9 wherein said minimum press speed is a press speed at
which said shut height of said press is within a desired tolerance value.
14. The method of claim 9 wherein said minimum press speed is input by direct
user
input into said controller.

-13-
15. The method of claim 9 wherein said minimum press speed is input into said
controller by digital signal from a user supplied auxiliary controller.
16. A method for compensating for the variation in shut height of a press as
it is
starting and stopping comprising:
inputting of a desired shut height range of said press at which feeding of
feed
material should commence;
continuous monitoring of actual shut height of said press;
comparing the actual shut height with the desired shut height range; and
feeding of said feed material by a press feed only when said actual shut
height is
within the desired shut height range.
17. The method of claim 16 wherein said press is a high speed punch press.
18. The method of claim 16 wherein the continuous monitoring of said actual
shut
height is performed by a linear displacement transducer.
19. The method of claim 16 wherein press feed is an electronically controlled
and
electronically powered press feed.
20. The method of claim 16 wherein said desired shut height range is a shut
height of
said press that enables parts to be produced within a desired tolerance value.
21. The method of claim 16 wherein said desired shut height range is input by
direct
user input into a controller for said press.
22. The method of claim 16 wherein said desired shut height range is input
into a
controller for said press by digital signal from a user supplied auxiliary
controller.
23. A method for compensating for the variation in shut height of a press as
it is
starting and stopping comprising:

-14-
inputting to a controller of a desired shut height range of said press at
which
feeding of feed material should commence;
continuous monitoring of actual shut height of said press;
feedback of said actual shut height of said press to said controller by a
feedback
device;
comparing said actual shut height of said press with said desired shut height
range
of said press by said controller;
sending a signal from said controller to a press feed to begin feeding said
feed
material to said press when said actual actual shut height of said press is at
least
within said desired shut height range; and
sending a signal from said controller to said press feed to stop feeding said
feed
material to said press when said actual shut height of said press is outside
of said
desired press shut height range.
24. The method of claim 23 wherein said press is a high speed punch press.
25. The method of claim 23 wherein said feedback device is a linear
displacement
transducer.
26. The method of claim 23 wherein the press feed is an electronically
controlled and
electronically powered press feed.
27. The method of claim 23 wherein said desired shut height range is a shut
height of
said press that ensures that parts produced by said press are within a desired
tolerance value.
28. The method of claim 23 wherein said desired shut height range is input by
direct
user input into said controller.

-15-
29. The method of claim 23 wherein said desired shut height range is input
into said
controller by digital signal.
30. The method of claim 23 wherein said desired shut height range is input
into said
controller by analog signal.

Description

. CA 02282525 1999-08-25
yV0 99136251 PCT,~US99/0006.J
;METHOD OF CONIPE~iS.~TING FOR SHUT HEIGHT VARIATION
T=~~ o ~ T~:~ l~rv=~.srTTorr
''h°_ preSelli. ._: 'v e~ :=Cn _?1 aC°S gc:'rer~~ ~'J t~ ...
method === compeaati: _ =cr ~ar_ation in shut he.~~t
~a~ sri G
pr=ss ir~ a s tamping cr foxing open ation when the press
or machine is stoned or started.
B~CKGROUN~ OF THE' INVF''''T_'ION
Whe_~_ stamping or forming parts with a press,
the fo~_-~red or coined dimensions of the parts are
dependent or. the shin height of the press remaiTing
constant. To ensure that the formed or coined dimens_ons
of the parts ar= acceptable, it a desired that the shut
height of the press remain constant or be within a
certain tolerance dictated by the nature of the parts.
Some precision forming or coining operations, such as
those relating to the manufacture of electrical
connectors, require that the shut height of the press be
held to plus or minus 0.005 mm. If the shut height noes
not remain constant, part dimensions will vary, possibly
outside of allowable tolerances.

CA 02282525 1999-08-25
W O 99136? 1 PCTIl; S99/0006a
Ju_ i.: =~~ ~~W .__..r v.?_r _~r'=_~,=S, S_aL0 _~_ _ ....
~C~='_; v3=_'S S ~Ow.1'_' aS r c r.;=ASS ~~ii_S ct COI'_St~'~_
Spe°_d . :.S t -°_ preSS .S S vODplnC a.~d S t~r tlllQ,
hOWe-.~ e.=
t-~-°- p~'~S.S 1S ODer 3t=T~G at a lOwc''~ Spe°~ til~'1 tl2e
COnSt~'? t
i w
O Spe°_d w:l°_ pr=SS at~31 nS Cu=1ng 5~..'-.a~J
S~at° ODerat~0.~_ 3riC
:~ a n ~ h c ~ r. ' ~ T~ . a v i ~ i- .r i _ ~ : ,~ n
t__~. s~_u_ =ht var__s . s szuz h__g.__ -,ra__~c_~..
dur ir_g s tar ring a.~d s topping is due maimy to dyna_~,tic
forces.
The typical shut height variation with press
speed in strokes per minute (spm) as a high speed press
s tarts up is depicted in FIG . 1. As depicted in FIG . 2 .
for the operation of a typical press during a particular
run, the shut height drops from its initial value at
star t up at time A to a steady state value within a
desired shut height range at time B. From time A to time
B, the press speed rises from zero (0) to some relatively
constant steady state press speed. During steady state
operation from time B to time C, the shut he=ght and
press speed remain relatively constant until the press
begins to stop at time C. From the initiation of the
stopping of the press at time C until the time the press
is stopped at time D, the shut height increases while the
press speed decrease to zero (0). f
-2-

CA 02282525 1999-08-25
WO 99/36251 PCT~'US9910006.1
't'he 'Jar=at=CT. iT: Shtl~ h ~ S
°'..~, .'.. :Jh_~ ~"-°SS _...
Sv.3=ring arid StODp~:lC, aS G°_._~~1C~°_n ~:1 '1r=. ~
:Tle~~_S t ha
=. , _
pa_ ~ d1m°_~s10n5 W11 ~ Var-J mCre, p055=D1 V Out O. ~ ~"" o
tJ_.._~...'1C~
values for the parts, as the press ~ s star ring a.~:c9.
S .'.C~_L''l:Ig ~.~"~3 t:deen ~'.lIIle :~ and ~ dPd be tTdB=W '..1-TIIe L'
a~'1d ~ .
Shut height var=an on occurs in pr'ss's
operating at all speeds. However, shut height variation
is much more pronounced, particularly while the press is
starting and stopping, for presses operating at higher
press speeds (generally above 600 spm).
Technology curre_~tly exists for maintaining a
constant shut height as a press is running at constant,
steady state operational speed. tintil the present
invention, no technology has e_~cisted for compensating for
tile variation in shut height as a press stops and starts
and the press speed is varying. Current technology
requires that material be fed to the press while the
press is starting and stopping and the press shut height
is varying, thereby producing bad, out of tolerance parts
due to the varying shut height. The present invention
eliminates the production of bad, out of tolerance parts
due to varying shut heights as the press is starting and
stopping.
-3-

CA 02282525 1999-08-25
CVO 99/36?51 PCT/i~S99/0006-1
c,~t=~v p= ''':. .hV"T=I~1'_'='~ IV
Disclosed a a method fo= compensatin c =o= ____
ri ~~i =n i' vi ~.' ro i r i ar_' Wn
va_ _.. ~_on shLt h__g_ - e-_ a p_ _ss as _ _ s s ~__ ~nc _d
stopping comprising user input cL the m~ni~-nurn pr=ss speed
at which feeding of G strip of mat=rial out of which t'
Dar is are t0 be COy_~_°.~.. O. stcmDe.~., the f~~~ mcteri3l ,
should commence, mor_itoring of the press speed, mud
feeding of th=_ feed material only when constant, st_a~,r
state press speed and shut height has been achieved.
~ method for compe_nsatir_g for the variation
IS
shut height of a press as it is starting and stopping
comprising inputting a desired shut height range at which
feeding of the feed material should commenced, monitoring
of the actual shut height, and feeding of the feed
material only when the shut height is w=thin the desired
shut height range is also disclosed.
BRIEF DESCRIPTION OF THE DRAtnIT~TGS
FIG. 1 is a graph of shut height versus press speed
during start up of a high speed press.
FiG. 2 is a graph of press speed and shut height versus ,
time far a typical press.
_g_

CA 02282525 1999-08-25
P CT,~C1 S 99/0006-i
WO 99136251
_ 1r. ~ =S a Scne:TlaL-.. O= .~ =ra='==o' o~l:C~ile~:. .._ _ ~~?
~~ V er L. ~ Wl .
..G. 4 a a schematic c. a_~ether p e=err=_d a ; en ci
r _ T_:1DOC_:Tl t
the invention.
D=T?_I~:~ DESC~I~~_'T_ON G. ?P~= =:?~~D ~GD =~1'?'S
a press feed 1 is typically used to feed strips
of the feed material 2 that will be stamped or fo=ned to
make the parts 3 to the press 4 as depicted in FIG. 3 in
schematic form. In a preferred embodiment, the press
reed 1 is an electronically controlled and electror_icalLv
powered press feed device.
A controller 5 is directly corrected to the
press feed 1 and the press feedback device 6 Which iS
connected to the press 4. Tn a preferred embodiment. rnP
controller 5 is capable of controlling the press feed 1,
receiving feedback information from the press feedback
device 6, and accepting input from the user specifying
the minimum press speed at which the press feed 1 should
operate. In a preferred embodiment of the method, the
controller 5 is capable of accepting direct user input of
the minimum press speed. In ot~ier preferred embodiments
of the method, the controller 5 is capable of accepting
_5_

CA 02282525 1999-08-25
WO 99/363=1 PCTiUS99/0006.t
c. G~C~ C. G==_t.~~ Sl='n~~ =a,-...~S~r,'~,.~C '~c .v.__-_:T.!21:~.
reSS S_.-1. ee.~. LrCm a us c= sL:pD 1 1°_Q C°_ v=C°_
(:=Or s: OW~ ? .
car r'rarrari ' A o f--~-~1 i cr
anoth__ p_______.~ emboc_m_nt, th_ con__~____ 5 ~s capable
of receiving a digi tal or_!off signet _rem c user SuLDl 1e~
a'.:~~C=~?~=i COnLrO_=~C (:'~OL Si'loWn; :'7t11C: SlgrG~S iNi_en t.l=
press shut h»ght has st~_liced.
Ir_ a preferred embodiment, the press 4
incorpor arcs and is - cen.-iec red to a press feedback devic _
capable of measuring the speed of the press 4 while the
press is operating, including when the press 4 is
stopping and starting. In a preferred embodiment, the
press feedback device is a resolves (not shown). In
another preferred embodiment the press feedback device 6
is a velocity feedback device (not shown).
I5 The minimum press speed at which t:~e electronic
press feed I should begin feeding of the strip of
material 2 out of which the parts 3 are to be stamped or
formed is input by a user into the controller 5 prior to
the commencement of operation of the press 4 and press
feed 1. The operation of the press 4 is then started.
The speed at which the press 4 is operating is
then measured by the press feedback device 6 of the press
4 which in turn transmits the press speed information
-6-

CA 02282525 1999-08-25
WO 99/36''51 PCT/US9910006.1
.".:~GCK ~'.:: tr°_ CC-t-=r~.~ 1°_. ~ . '=~°_ C :W':'=
:=1 or ~ ~nan p
C I:'y c=
.1e S~e°~ C. t~? Dr°_S.~ ~s W=th t~e .. ~ ~~--°'~ '~ ra
t _ _ L v. _ Ti__.~.~.l2iI:1 J_ S S
'
Speed. .~_ the Seed Gi x.:12 pr?SS ns 1S Ciedter t ~~~ pr
e~3Lla~ tG the i nput t°_~ :IL_TllmLIm preSS Speed,
t.? a C Gn tr 01 1 er
~'" l ''~._ ~~"2S food l ~'.O S ~.3r.'. =°eG'=~g tt'1°
SenCS Ci J~~ttG~ tG L__. ~ J
Leed material 2 into the press 4 which will sta.~m or =or<n
the parts 3 . I. the speed o~ t he press 4 is lower than
the inputted minimum press speed, the controller ~ sends
a signal to the press feed 1 to remain out or operatior_
or stop feeding the feed material 2.
Once the speed of the press ~ has met or
exceeded the minimum press speed, the speed oL the press
4 is continually monitored by the press fee3back device 6
and compared with the inputted minimum press speed by the
IS controller 5. Should the speed of the press 4 be
measured at a value below the inputted minimum press
speed at anytime during the operation of the press 4, the
controller 5 will send a signal to the press feed 1 to
stop feeding the feed material 2. While the press 4 is
stopping, the controller 5 will likewise send a signal to
the press feed 1 to stop feeding the feed mate=ial 2 when
the measured press speed sent by the press feedback
device 6 back to the controller 5 is below the inputted
minimum press speed.

CA 02282525 1999-08-25
WO 99136251 PCTiL'S99/0006.1
1_~. c_''1GC.I'?ar pr°__'er~?~ 2~'~~.CG'~1T ent SIlOtN'n __. , =~ .
w'. a ~''~SS ~ laCO'~Gra e5 a pr°_S" ~?~~~S DdCk Ce'~ ~.__
C3Dab~e O!' me3SUrlng t. a siallt height OL the pr°SS ~ Whil ~?
the press 4 is opera~ing, including when the press 4 is
S ~'.O~D= ~ an C S tar ''.3.:1C . T_~_ t:115 pr .'-.'' a== eQ e~lbGd' ILle_~
v. .'_°
cr i n ' p ~ -t ,ran ~ t r
cor.,.yoll__ 5 s c~pab_e G. acc'pt_l_g di__..o Lse_ input G=
the recuired shut height range. _n a_Tother version oL
this preferred embodiment the controller 5 is capable of
accepting an analog' or digital signal representing the
required shut height range from a user supplied device
(not shown).
The rec_ruired press shut height at which the
press feed 1 should begin feeding of the str~~ of
material 2 out of which parts 3 are to be stamped or
formed is input into the cont=oiler 5 prior to the
commencement of operation of the press 4 and press feed
1. The operation of the press 4 is then started after
the required press shut height is input.
The shut height at which the press 4 is
operating is then measured by the shut height feedback
device 7 of the press 4 which in turn transmits the shut
height information back to the controller 5. In this
preferred embodiment, the feedback device 7 is a linear
displacement transducer. The controller 5 then compares
_g_

CA 02282525 1999-08-25
WO 99136351 PCTIUS99I0006.1
~}'le Sllut ~o;,r~Zt OL t.~.e ~r°SS ~ W_t. t~= _~_'L'i:Ce.°C
C°_S~.=°.~_
s =ut h=_;a~-~t ra~ge. __ to m_asu==_d s'.~_ut reigrt -_ w_th__~_
t=1e desr.=°_r. rSl'1Qe SpeC~fle.~r, the coat=O~ 1~~ ~ Sc'~nCs n
Signal t0 the press _eed ? to f°°d material ?. ?'ie
..
control l er 5 continually mon=torn the press sh ut re_g_
'v~3 the =°_°_.~r~.~~aCZC Ce'~lCe 7. ~= at anVtlm° Gu~~.-
lg
operation of the press 4, the shut heig ht de~riates
outside the specified range, controller S signals the
press feed 1 to stop feeding material 2.
In a third preferred e.'nbodiment, when it is
sufficient to prevent the production of bad parts at
press start up and not at press stoppage, the feedback
device 7 may be replaced with a stroke-counter (not
shown). The user inputs a value representing the number
of press strokes to skip during start up to the
controller 5. The controller 5 then compares the number
of press strokes counted by the stroke-counter and
transmitted to the controller 5 to the inputted number of
press strokes to skip. When the number of press strokes
counted by the stroke-counter exceeds the inputted number
of press strokes to skip, the controller 5 signals the
press feed 1 to begin feeding the feed material 2.
In a preferred embodiment of the embodiments
described abov=_, the press 4 is a high speed punch press,
_g_

CA 02282525 1999-08-25
WO 99136=~1 PCTIUS99/0006~
o ~ .~ +- ~ ~ !- h o ,-
w; c.h toc_irg . Oth_= mbocim_n_s :na r _nvc_ v= c _____ =or:ra
r i c , o,-w- ~ ~ -,cods
c. presses ~u_~__ va_ Ls cg__ _~.cn'_ s~ b__ause s. T
he=ght v ar iation occur s =or pr esses oiler a tig a t ~n_r
speed . In a pre _ .r r ed embodi_nen t o f the e_nbocime~ is
0 ,-; a r ~ o ,-o i
d_sc__be_ a:~ov_, tz_ p__ss 4 s a e____ror_=call-r
COntr0lled and °!eCt=OniC3l~V DOWere~ pr°_SS f=°_Q.
The embodiazents described above are to be
considered in al? respects only as illustrative and not
restrictive . The scope of the ir_vention is indicated by
the following claims rather than the foregoing
description. All changes which come within the meaning
and range of equivalency of the claims are to be embraced
within their scope.
-IO-

Dessin représentatif